Portable power bank



FIG. 1 is a front view of the portable power bank.

FIG. 2 is rear view of the portable power bank.

FIG. 3 is top view of the portable power bank, the bottom being a mirror image thereof.

FIG. 4 is a left side view of the portable power bank.

FIG. 5 is a top, front, left perspective view of the portable power bank.

FIG. 6 is a top, rear, right perspective view of the portable power bank; and,

FIG. 7 is a top, front, left perspective view of the portable power bank with the USB cable extended. 

CLAIM The ornamental design for a portable power bank, as shown and described. 